Table 2.
Harris hip score in comparative studies of bearing surfaces. Figures are mean scores (higher scores indicating better outcomes) (SD and range when available) for longest period of follow-up reported
| Study | Metal on metal | Ceramic on ceramic | Metal on polyethylene | Ceramic on polyethylene | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Preoperative | Postoperative | Preoperative | Postoperative | Preoperative | Postoperative | Preoperative | Postoperative | ||||
| Dahlstrand, 2009*, Sweden27 | 38.1 (10.9) | 92.8 (12.9) | NA | NA | 38.9 (12.7) | 95.9 (4.8) | NA | NA | |||
| Engh, 2009, US28 | Done but NA | 93.5 (9) | NA | NA | Done but NA | 96 (6) | NA | NA | |||
| Jacobs, 2004, US40 | 42 | 95.4 (65-100) | NA | NA | 43 | 96.1 (65-100) | NA | NA | |||
| MacDonald, 2003, US36 | 46.5 (13.4) | 91.6 (11.5) | NA | NA | 46.6 (12.4) | 89.2 (12.5) | NA | NA | |||
| Zijlstra, 2009†, Netherlands29 | 48 (15) | 90 (7) | NA | NA | 46 (13) | 87 (13) | NA | NA | |||
| Dorr, 2004, US34 | NA | 93.5 (12, 14-100) | NA | NA | NA | NA | NA | 93.5 (11, 41-100) | |||
| Bascarevic, 2010, Serbia38 | NA | NA | NA | 95.1 | NA | 93.8 | NA | NA | |||
| Capello, 2008,30 D’Antonio, 2005,31 US | NA | NA | NA | 96.35 | NA | 96.4 | NA | NA | |||
| Capello, 2008, addition of 4th system, Trident, US30 | NA | NA | NA | 95.7 | NA | 96.4 | NA | NA | |||
| Hamilton, 2010, US20 | NA | NA | 50.6 | 94.4 | NA | NA | 50.7 | 93.8 | |||
| Kim, 2009, South Korea35 | NA | NA | 39 (6-47) | 93 (85-100) | NA | NA | 41 (9-51) | 94 (86-100) | |||
| Lombardi, 2010, US21 | NA | NA | 51 (6-68) | 90 (50-100) | NA | NA | 48 (6-69) | 92 (49-100) | |||
| Ochs, 2007, Germany22 | NA | NA | NA | 91 (21.6) | NA | NA | NA | 89 (12.1) | |||
| Poggie, 2007, US23 | NA | NA | 45 (14-91) | 92 (36-100) | NA | NA | 43 (10-78) | 93 (51-100) | |||
| Kawate, 2009, Japan25 | NA | NA | NA | NA | 47 (28-77) | 91(60-100) | 43 (15-75) | 89 (58-100) | |||
| von Schewelov, 2005, Sweden26 | NA | NA | NA | NA | NA | 91.7 (11.2) | NA | 91.3 (10.5) | |||
| Grubl, 2006, Austria24 | 50.4 (15.1-71.4) | 85.1 (61.1-100) | 58.4 (24.4-82.3) | 86.6 (41.5-100) | NA | NA | NA | NA | |||
NA=not available (not applicable or not provided).
*Significant difference favouring metal on polyethylene compared with metal on metal at 12 months but not at 24 months after surgery.
†Measurements at two and five years. Only score at five years reported here (fig 2 shows both two and five year scores).